hutchison



(N0 MOdGL) I 2 Sheets-Sheet 1.

Y R.v G. HUTCHISON PULP STRAINER.

N5. 578,515. Patented Mar. 9,1897.

FIG-.4.

KMQMSMW UNITED ASTATES PATENT OFFICE.

ROBERT GIBB IIUTOHISON, OF SITTINGBOURNE, ENGLAND.

PU LP-STRAINER.

SPECIFICATION forming part of Letters Patent N o. 578,515, dated March 9, 1897. Application led October 3, 1896. Serial No. 607,777. (No model.) Patented in England April 6, 1893, No. 7,112l

To all whom/it may cm1/cern:

Be it known that I, ROBERT GIBB HUTCHI- SON, a subject of the Queen of Great Britain, and a resident of Sittingbourne, Kent county, England, have invented certain new and useful Improvements in Pulp-Strainers, (which have been patented in England, No. 7,112,

dated April 6, 1893,) of which the following is a specification.

This invention relates to pulp-strainin g apparatus; and it consists of an apparatus in which the strainer is made of conical formation and is suspended within a vat with its upper surface below and parallel with the surface of the pulp, and its axis at an inclination, and with all the taper of its form disposed toward the part belowr its upper surface and where the density of the pulp is the greatest, and presenting an acting surface inclined to and acting against the flow of the pulp, and is so operated as to have continuous rapid combined endwise and vertical pulsations imparted to it, which produce a powerful vacuous tendency within the strainer, effective in causing the pulp to stream through the strainer much more rapidly than in existing strainer-s and in automatically keeping its outside clean and its slits from being choked.

. On the accompanying drawings, Figure 1 represents a side elevation of the apparatus.

Fig. 2 represents an end elevation of the discharge end in section on line c d, Fig. 4. Fig. 3 represents a sectional elevation of the other end on line e f, Fig. 6. Fig. 4 represents a plan taken as at right angles to the axis of the strainer. Fig. 5 represents a partial sectional elevation on line g h, Fig. 1; and Fig. 6 represents a sectional elevation on line 'i j, Fig.. et.

A is the strainer, and B is the vat, which are respectively constructed and adapted to cooperate as hereinafter described, and C is Vthe means for giving the desired motion to the strainer within the vat.

The strainer A is of conical formation, circular at all sections at right angles to its axis, and is constructed with a frame consisting of a closing end piece a', coned at c2 and flanged at a3 at its smaller end, and of an annular end piece a4, coned at a?, flanged at a6, and

`connected by arms a7 to a central boss as at its outlet end, which end pieces o. a4 respectively serve to support two correspondinglyconed rings a9 d10, which are connected by longitudinal ribs all, to the outer surfaces of which and of the rings 1,9 L10 sectoral conical strainer-plates am are secured by bolts cl3.

The strainer-plates al? are perforated with closely-adjacent line slits d, running longitudinally of the strainer, the fineness of the slits being regulated by the class of fiber intended to be dealt with inthe machine.

The strainer Ais suspended within the vat B (vde Fig. 5) with its upper surface horizontal and its axis at an inclination and its under surface at-a correspondingly-increased inclination, the bottom b of the Vat being made of a corresponding inclination and formation to that of the under part of the strainer and its upwardlyextending sides h2 being parallel. (Vide Fig. 5.)

In the ends b3 b4 of the vat openings b5 h6 are made concentric with the axis of the strainer and of larger diameters than the adjacent ends of the strainer, and in the planes of these openings and concentric therewith the strainer ends are supported by a shaft d, as hereinafter described, the spaces between the strainer ends and the rims of the vat end openings being then closed by flexible annular diaphragms e, which are secured to the adjacent parts by rings C115 and bolts 0,16 and serve to keep ythe pulp within the vat, while permitting of the movements of the strainer.

The shaft d is 'arranged at an inclination with its axis coincident with that of the strainer and is pivotally supported externally of and at the delivery end of the Vat by an eyeleted collar d and a link d2 from an ad,- justable center f, supported by the outletcasing f', and at the other end is mounted on an eccentric c on the actuating-shaft C. The strainer end a abuts against a collar d3 on the shaft d, which is reduced in diameter at d4, and abuts against an inner flange c at the end of the boss C08 of the strainer end. a4.

In the outlet-casing f is formed an end opening f2, concentric with the axis of the shaft and of larger diameter than and in the plane of the boss a8, the space between the boss and the rim of the opening being closed by a liexible annular diaphragm f3, which is ICO secured to the adjacent parts by rings f4 and bolts f5 and serves the like purposes to those served by the diaphragm e.

The shaft C is mounted in bearings c2, car- 5 ried by a stool-bracket c3, which also supports the adjacent end of the vat and is provided with fast and loose pulleys c4 c5 and with a regulating fly-wheel c6. The throw of the eccentric c is preferably between about onero eighth to one-quarter of an inch, and the shaft O revolves at about five hundred to six hundred revolutions per minute.

The outlet end of the vat is supported by a stool b'? and at its lowest point is connected with a pipe hs, serving to drain off the refuse and unprepared pulp, iiber, or material that will not pass through the strainer. The pipe 128 is provided with two cocks b9 Z210, the former of which can be used when the strainer zo is in operation for leading the discharge to an auxiliary apparatus, where it can be again utilized.

The outlet f6 of the casing f is connected with a conduit f7, leading to the service or regulating box f8. The strained pulp gravitates in a regular discharge of strained and iinished pulp, ready for the paper-making machine, to the outlet f6 and finds its level in the casing f', according to the height of the 3o regulating-sluice f9 of the service-box, which is always lower than the level of the pulp in the vat, (indicated by the dotted line g in Fig. 6,) so as to create the necessary fall, and the vat is kept continuously supplied with 3 5 pulp, so as to keep the required head.

The casing f is also formed with two handholes f 10 at the end and with two others at the top, each thereof being closed by a cover fu,

secured bya screwf, engaging with a bridge- 4oipiecef13, hinged to the casing, as at f, the arrangement being such as to permit of the ready removal of the covers, when required, to wash out and clean the interior of the strainer, and of the ready replacement thereof. By such means, when the apparatus is in operation, steady continuous rapid combined endwise and vertical pulsating movements are imparted to the strainer, the vertical movements being accommodated by the give and 5o take of the diaphragms ef, which latter also, together with the linked connections cl/ d2 of the shaft d, accommodate and permit of the endwise reciprocations of the shaft and strainer. The inclined disposition of the bot- 5 5 tom of the vat tends to produce a natural gravitation of the pulp to the outlet, and the inclined disposition of the conical strainer, with its top surface horizontal, disposes all the taper thereof toward the lower part,where 6o the density of the pulp is the greatest, and

the peculiar endwise motion imparted to the strainer causes it to have a suctional action on the pulp when receding and to present an acting surface inclined to and against the flow of the pulp when returning, in contradistinction to the slipping motion of cylindrical strainers reciprocating in arcs coincident with their radii, as hitherto used. This peculiar motion ofthe strainer is also effective in automatically keeping its outside perfectly clean and its slits free from all choking, which is 'a defect inherent to such cylindrical strainers. v

In lieu of the combined endwise and vertical motion I may impart to the inclined conical strainer a combined endwise and lateral motion, or I may arrange it with its axis at a greater or less inclination than aforesaid or horizontally or vertically and may impart to it simply a reciprocating endwise motion or a conical motion about its bottom as a center, if its axis be arranged vertically.

I claim as my inventionl. A pulp-strainer apparatus consisting of a vat a conical strainer suspended therein with its upper surface below and parallel with the surface of the pulp, and its axis at an inclination, and with allthe taper of its form disposed toward the part below its upper surface and where the density of the pulp is the greatest, and presenting an acting surface inclined to and acting against the flow of the pulp, and means for imparting continuous rapid combined endwise and radial pulsations to said strainer, as set forth.

2. In a strainer, in combination, a shaft d, shouldered at cl3, and reduced at d4, coned strainer ends a, a4, supported by the shaft and held against the abutments thereof, end rings a9, d10, connecting-rails a, and conical strainer-plates am, as set forth.

3. In combination, a shaft shouldered at d3, and reduced at d4, coned strainer ends a', a4, supported by the shaft and held against the abutments thereof, end rings a, d10, connecting-rails a, and conical strainer-plates cl2, a vat B, having a semiconical inclined bottom Z9', and through end openings b5, h6, and an outlet f', liezrible diaphragms e, f3, connecting the strainer with the vat and the outer casing, and means of pivotally supporting the shaft at one end, and of imparting to it at the other end combined endwise and radial pulsating movements, as set forth.

In witness whereof l have hereunto set my hand in presence of two witnesses.

ROBERT GIBB HUTCHISON.

Vitnesses: p

ERNEST EDWARD PAIN, GEORGE SMITH.

IOO 

